The invention relates to a portable meteorological monitoring device which comprises a power service module, a data acquisition module, an application management module, a data storage module, a bluetooth service module, a system basic service module and a power management module. The portable meteorological monitoring device acquires, stores and processes meteorological information to provide service for production and daily life. Power supply management is optimized, the power capacity is greatly increased, stable current is maintained, and electric output is reduced. A buck converter is optimized, and power losses can be reduced. An application management module is additionally arranged to manage applications so as to work in an optimized streamline mode and prevent waste of work period of the device. The power supply for the portable meteorological monitoring device lasts longer.